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In order to accurately retrieve the microphysical parameters of snowflake particles using radar, the exponential distribution of nonspherical snow particle swarm is established and the backscattering crosssections of nonspherical snow particle swarm at six different incident directions are calculated at 94 GHz using the XFDTD software and then compared with the results of simple addition. For the same incident directions, all the backscattering crosssection results of the particle swarm are larger than the result of simple addition. For the different incident directions, the backscattering crosssection results of the particle swarm are different. These results show that the direction of multiple scattering and incident electromagnetic wave must be considered in the actual radar detection.